Leo goldhammer



Mar-ch 8, 1932.

PHoToGRAPHIc SHUTTER` Filed Qot. 8, 1929' i zsheets-sheet 2 Z 4 lllllhL. QOLDHAMMER 1,848,523

Patented lMar'. 8, 1932 UNITED sTATEs PATENT OFFICE Lao eonnnamma, orMUNICH, GERMANY, assIGNoa 'ro nera' misco concurren. ornmenan-'romnnwyoam a coaroaa'rIoN or NEW' Yoan A PHOTOGBAPHIC SHUTTEB,AApplioation led October 8, 1929, Serial No. 398,248, and in GermanyOctober 8, 1828.

My present invention relates to photographic shutters and more`particularly to shutters, the bladesof which 'are automaticallytensioned and released by pulling the .r operating lever downwardly. Y

One of its objects relates to the bearing of the operatin lever ofthe'shutter.

Another o ject of m invention is to coordinate the operating ever withthe spring actuated shutter blades in such a manner that the shutter istensioned and opened directly by a cam on anotherjpart of the operatinglever.

A still further object of my 'invention is 1G to provide an operatinglever which when adjusting the shutter to time opens directly thelocking device of the b ades, without need of a separate lever ashitherto required. Y Other objects and advantages in details ofconstruction and operation will be apparent as the description proceeds'reference being hadv to the accompanying-drawing wherein n n n n l likereference numerals indicate like parts.

Fig. 1 isan interior view of my shutter.

Fig. 2 is a view similar to Fig-1 showing the shutter parts in aposition they occupy when tensioned ready lfor-:exposure with closedblades.

-So Fig. 3 is a view similar to Figs. 1 and 2 illustrating the shutterwhile stantaneous exposure..

effecting `in- Fig. 4, likewise, is a View similar to Figs.

- 1 and 2 illustrating the shutter while effect- -ter and may Referringmore particularly to the illus- Fig." 5 comprises an arm 6 and a plate5v with curved margins and with an annular opening capable to embracethe cylindrical rotary position. By a s rin 9 anchored-with one end tothe casin 1t is eld in its initial position shown in ig. 1.A

,- 10 and 11 are'the shutter blades. The blade 10 is rotary mounted onthe blade 11 with a pin 12, while .the blade 11 is givoted on a pin 13in the shutter casing. prings l14 and 15 tend always to holdthe blades10 and 11 in the closed position seen in Fig. 1.

y holders 7 se- The blade 1,0 is provided with a bent la 16, y

whichstrikes an angular shoulder 17 o the blade 11, if the shutter isclosed.

On the annular operating lever 5, a cam 18 is fitted so as to be rotaryVround a bolt'19. v

The external edge of the said cam 18 is bent rectangularly, so that ailap 20 of the'cam projects backwards and abuts against a pin 21 mountedon the blade 11, when the operating lever is turned. The cam 18ispressed against the cylinder wall 2 by the action of the spring22. i

23 is a locking lever or ratchet pivoted in the shutter casing andpressed by the spring 24 against the pin 25. The' pin 25 isconnected'with a re lating device outside the shutmoved to and froradiallyin' the shutter'casing, vwhereb the position Vof the ratchet 23is altered. rom the ratchet 23 a pin 26 projects through a slit providedin the intermediate piece 4, so that it may come in contact with thecurved margin 27 of the operating lever 5.

'Ehe shutter operates as follows: In normal position, all parts of theshutter are situatedas seen in Fig. 1. If the o eratingarm 6 isdepresseddownwards, t'e plate 5 and the cam 18 connected therewith are turnedround the central flan e 2psurrounding the shutter opening 3. e free pend 20 comes in' contact with the pin 21 and thus swings'the shutterblade 11 about its pivot 13. v The shutter bladelO, being pivotedon theblade 11 and striking with its bent vlap 16 against the angular shoulder17 of the engagement with the nose at the front part of the ratchet 24,while the blade 11 strikes with its angular shoulder 17 the bent lap 16of blade 10. This is shown in Fig. 2.

The exposure now is accomplished through a. further movement of theoperating arm 6 in downward direction, by which the nose 20 of the cam18 slides away from the pin 21 and sets it and therewith the shutterblade 11 free. The blade 11 swings back in its initial position b v theaction of the spring 14. whereupon the pivot 12 performs a circular wayon account of its eccentric position regarding the pivot 13. Thereby,the blade 10 undergoes a downward movement and the l shoulder 16 of theblade 10 slides away from the nose of the ratchet 23 until it leaves theaction of the latter and snaps back by the action of the spring 15 inits initial position. Fig. 3 shows the shutter while the obiectiveopening` is partly opened for instantaneous exposure.

The duration of exposure. obviously. is iniuenced bv the placing of theratchet 23. If the pin 25 infiuences the ratchet 23 to strike onlypartly the shoulder 16, the blade 10 snaps back before blade 11 hascompleted its return movement. If the blades have returned to theiroriginal position, the operating plate 5 connectedwith the arm 6 becomesfree and swings back together with the cam .18 in the position shown inFig. 1 by the pin 25 to engage the shoulder 16 of blade 10,

if the arm 6 is completely depressed, to such a degree that the lengthof its engagement is eater than the downward movement of the blade 10.Thus. the blade '11 remains arrested in its position giving free theexposure opening until the arm 6 is allowed to return in its initialposition. Then the curvature 27 strikes the pin`26 of the ratchet 23,erects the latter and sets free the blade 10, which now` likewise, snapsback and closes the obiective opening.

Bv the specific form and bearing of the operating lever the tension andoperation of the shutter blades is effected in a simple manner and thcnumber of intermediate parts and levers is diminished, a part of theoperating lever acting directly on the shutter blades.

Such a shutter on account of its simple construction can bemanufacturedat low cost and loperates exactly.

What I claim is: i

p1. A photographic' shutter comprising in operative combination a casingVwith a cen- Atral exposure opening, blades, and means for makinginstantaneous and time exposures;

lsaid means including a speed controlling elefor said blades, anoperating lever rotatably mounted concentrically to the exposureopening, a spring holding the operating lever in its initial positionand means mounted, onv

said operating lever for tensioning and releasing the shutterv bladesautomatically and' directly.

3. A photographic shutter comprising' in operative combination a casingwithl a central exposure opening, blades and means for makinginstantaneous and time exposures; said means including aspeedcontrolling element for said blades, an operating lever rotatablymounted concentrically tothe exposure opening, a spring holding theoperating lever in itsinitial position, a pivoted cam mounted on saidoperating lever and means for causing said cam to tension and to releasethe shutter blades automatically and directly.

4. A photographic shutter comprising in operative combination a casingwith a central exposure opening, means for making instantaneous and timeexposures; said means including an` operating lever rotatably mountedconcentrically to the exposure opening, a shutter bladepivoted in theshutter casing, a second shutter blade pivoted upon the first shutterblade, springs for holding` the blades in closed position, a cam mountedon the operating lever and means for causing said cam to tension and torelease successively the said shutter blades directly and automatically.I

5. A photographic shutter comprising in operative combination a casingwith a central exposure opening, means for making instantaneous and timeexposures; said means including an operating lever rotatably mountedconcentrically to the exposure opening, a shutter blade pivoted in theshutter casing, a

Vsecond shutter blade pivoted upon the rst shutter blade` springs forholding the blades in closed position, `a cam mounted on the operatinglever, means for causing said cam to tension and to release successivelythe said shutter blades directly and automatieall and means on theoperating lever for unlocging the blades pivoted in the shutter casingin time exposure during the return movement of the operating lever inits initial position.

In testimony whereof, I ax my signature.

L Eo GOLDHAMMER.

